The metal kit is a great upgrade that'll add consistency to your blaster, unfortunately the 2.0 spring is TOO STRONG for the internals as after trying to rack and shoot the first dart, the trigger pull was so rough to pull. After trying to prime again, the internals felt gummy. When going back to the 1.8 spring, the blaster worked fine, but unfortunately, the slam fire is no longer operational. Get this kit if you want a decent upgrade, but the spring to too strong to use at all. It's unfortunately as the kit can be slightly cheaper without the spring. Also, the stock fully extended will slowly break with the heavy load for a prime
